ANODONTA. 535 
Anodonta cornea, Philippi, Zeitschr. f. Malak. v. p. 130 (1848), also from Nicaragua 
(Largilliert), resembles this species, according to description; but as the author says 
““Margine angustato, subrostrato,” I dare not identify it with Lea’s species. 
Var. granadensis. 
Anodonta granadensis, Lea, Proc. Acad. Phil. 1868, p- 96°; Journ. Acad. Phil. (2) vi. p. 288, t. 41. 
fig. 100°, =Obs. Gen. Unio, xii. p. 48, t. 41. fig. 100". 
More oblong, fore part also short and rounded, hinder part somewhat more distinctly rostrated, ventral margin 
straight at its middle. Outside yellowish or green-rayed ; inside bluish-white, very iridescent. 
Long. 35; alt. vert. 21, ale 21, diam. 14 millim. Vertices in 4 long. 
Hab. Centrau Nicaragua: Lake of Nicaragua (Bridges 9). 
Euryanopon, Fisch. & Crosse. 
14. Anodonta bambusearum. 
Anodon bambousearum, Morelet, Test. Noviss. ii. p. 24 (1851) *. 
Anodonta bambousearum, Fisch. & Crosse, Miss. Scient. Mex., Moll. ii. p. 527, t. 63. figg. 6, 6a°. 
Anodonta pepiniana (Lea), Clessin, in Martini & Chemnitz, Syst. Conch.-Cab. ed. 2, Anodonta, 
p- 158 (part.) *. 
Near A. cylindracea, but higher behind the summits, scarcely sinuated below, and not so distinctly bent 
downwards behind, with a few dark rays on the hinder slope of the shell. Sinulus of the ligament 
sharply triangular, as deep as long ; anterior side concave, posterior side convex, point bent forwards. 
a. Long. 75; diam. vert. 34, ale 40, diam. 24 millim. Vertices in Zz long. 
b. ” 49 3 99 24, ” 26, 9 . 14 99 29 2 99 
a. Morelet’s specimen, figured by Fischer and Crosse ; 6. Specimen from Misantla. 
Hab. EF. Mexico: Rio de Misantla (Deppe, in Mus. Berol.). 
S.E. Mexico: small streams near Palenque, State of Chiapas (Morelet } ?). 
15. Anodonta cylindracea. 
Anodonta cylindracea, Lea, Trans. Am. Phil. Soe. vi. p. 45, t. 8. fig. 40 (1836) ',=Obs. Gen. Unio, 
ii. p. 45, t. 18. fig. 40°; Hanley, Catal. Rec. Bivalves, p. 223°; Clessin, in Martini & 
Chemnitz, Syst. Conch.-Cab. ed. 2, Anodonta, p. 161, t. 53. figg. 5, 6 *; Fisch. & Crosse, 
Miss. Scient. Mex., Moll. ii. p. 528°. 
Anodon cylindracea, Sowerby, in Reeve’s Conch. Icon. xvii., Anodon, t. 24. fig. 93°. 
Elongated, but not truly cylindrical, because the diameter in the most convex part is only a little more than 
two-thirds of the height; posterior extremity bent downwards, ventral margin a little sinuated. 
a. Long. 73; alt. vert. 32, ale 33, diam. 234 millim. Vertices in 2-7 long. 
1 
b. be 71; 29 30, ” 34, ” 3 ” ” = 9 . 
Hab. EF. Mexico: Rio Medellin, near Vera Cruz (Dr. Burrough ***). 
Externally, this species bears a remarkable resemblance to Unio aztecorum, Phil., 
from the same region. Fischer and Crosse ® distinguish the form figured by Sowerby © 
as var. subarcuatula, but there is no reason to give it a distinct name. It is to be 
regretted that Lea, who figures in most species the sinulus of the ligament very 
clearly, did not indicate it at all in this shell. From its resemblance, However, to 
